61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* VTreeFS - path.c - by Alen Stojanov and David van Moolenbroek */
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#include "inc.h"
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/*===========================================================================*
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* fs_lookup *
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*===========================================================================*/
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int fs_lookup(ino_t dir_nr, char *name, struct fsdriver_node *node_details,
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int *is_mountpt)
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{
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/* Resolve a path string to an inode.
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*/
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struct inode *node, *child;
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int r;
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if ((node = find_inode(dir_nr)) == NULL)
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return EINVAL;
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if (!S_ISDIR(node->i_stat.mode))
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return ENOTDIR;
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if (strlen(name) > PNAME_MAX)
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return ENAMETOOLONG;
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if (!strcmp(name, ".")) {
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/* Stay in the given directory. */
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child = node;
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} else if (!strcmp(name, "..")) {
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/* Progress into the parent directory. */
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if ((child = get_parent_inode(node)) == NULL)
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return ENOENT; /* deleted? should not be possible */
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} else {
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/* Progress into a directory entry. Call the lookup hook, if
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* present, before doing the actual lookup.
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*/
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if (!is_inode_deleted(node) &&
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vtreefs_hooks->lookup_hook != NULL) {
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r = vtreefs_hooks->lookup_hook(node, name,
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get_inode_cbdata(node));
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if (r != OK) return r;
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}
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if ((child = get_inode_by_name(node, name)) == NULL)
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return ENOENT;
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}
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/* On success, open the resulting file and return its details. */
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ref_inode(child);
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node_details->fn_ino_nr = get_inode_number(child);
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node_details->fn_mode = child->i_stat.mode;
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node_details->fn_size = child->i_stat.size;
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node_details->fn_uid = child->i_stat.uid;
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node_details->fn_gid = child->i_stat.gid;
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node_details->fn_dev = child->i_stat.dev;
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*is_mountpt = FALSE;
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return OK;
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}
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